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Asynchronous motor parameter identification method

A technology for asynchronous motor and parameter identification, which is applied in the direction of estimation/correction of motor parameters, and can solve problems such as identification and inability to complete asynchronous motor parameters

Active Publication Date: 2013-09-04
CHANGZHOU LIANLI AUTOMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The identification of the mutual inductance of the asynchronous motor is completed through the no-load experiment, but the no-load experiment often has no experimental conditions in the industrial field, and the identification of the parameters of the asynchronous motor cannot be completed

Method used

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  • Asynchronous motor parameter identification method

Examples

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Comparison scheme
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Embodiment Construction

[0037] The present invention is to identify the stator leakage inductance L of the asynchronous motor in the static state of the motor ls , rotor leakage inductance L lr , motor mutual inductance L m and rotor resistance R r a method of The method that the asynchronous motor parameter of the present invention is comprises the following steps:

[0038] a. Set the asynchronous motor to the single-phase test state, that is, open one phase of the asynchronous motor, and connect the other two phases to the frequency converter. like figure 1 As shown, connect the asynchronous motor to the three-phase output of the inverter. Among them, the switch tube S 5 and S 6 Normally closed, make the C phase of the motor open. When the AC current is applied, the motor remains at rest. Switch tube S 4 Normally open, so that phase B of the motor is connected to the negative terminal of the DC bus. Switch tube S 1 In chopping state, control the output current of the inverter by control...

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Abstract

The invention relates to an asynchronous motor parameter identification method, in particular to an asynchronous motor parameter off-line identification method. Sine-wave current signals with different frequencies are accessed to an asynchronous motor stator winding twice; equivalent total leakage inductance and mutual inductance are computed according to a T-shaped equivalent circuit in a motor single phase test; trapezoid current signals are accessed to an asynchronous motor stator resistance; the output voltage of a frequency converter on the ascent stage of the trapezoid current signals is detected; a stator leakage inductance and a rotor leakage inductance of an asynchronous motor are computed; the output voltage V of the frequency converter at the horizontal stage of the trapezoid current signals is detected; and an asynchronous motor rotor resistance is computed. Due to the adoption of the method, the parameters of an asynchronous motor can be rapidly identified, and meanwhile, the output of the frequency converter can track the given current signals through a PI (proportional integral) current controller; and the zero crossing point distortion of current which is caused by the influence of frequency converter tube voltage drop and dead zones can be avoided through adding direct current bias in the input current signals of the frequency converter.

Description

technical field [0001] The invention relates to a method for identifying parameters of an asynchronous motor, in particular to a method for off-line identifying parameters of an asynchronous motor. Background technique [0002] As the needs of industrial sites put forward higher requirements for frequency converters, vector control technology is widely used in occasions that require high-performance control of asynchronous motors. The ultimate goal of vector control is to realize the decoupling of torque and flux linkage control. So as to realize the high-performance control of the asynchronous motor. The realization of torque and flux linkage control of asynchronous motor depends largely on the identification accuracy of asynchronous motor parameters. [0003] Generally, the parameter identification of asynchronous motor can be divided into offline identification and online identification. The off-line identification of asynchronous motor parameters refers to applying va...

Claims

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Application Information

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IPC IPC(8): H02P23/14
Inventor 杜恩利张贞飞何礼高
Owner CHANGZHOU LIANLI AUTOMATION TECH
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